One needs a magnifying-glass to see everything there is to be seen in the landscape through the window on the left. Besides the city with its towers and walls and the mountains behind, there is a river in the foreground where two little people are sitting in a boat. Observe every tiny stone in the pavement, and every open page of the books on the shelves. Here, too, is breadth in the handling. Hold the book far away from you, so that the detail of the picture vanishes and only the broad masses of the composition stand out. You still have what is essential. The picture is one in which Italian feeling and sentiment blend with Flemish technique and love of little things. There has always been something of a mystery about the picture, and you must not be surprised some day if you hear it asserted that Antonello did not paint it at all. Such changes in the attributions of unsigned paintings are not uncommon. One of the greatest pioneer artists of the fifteenth century was Andrea Mantegna of Padua in the north of Italy. More than any other painter of his day, he devoted himself to the study of ancient sculpture, even to the extent of sometimes painting in monochrome to imitate the actual marble. Paintings by him, which look like sculptured reliefs, are in the National Gallery; and at Hampton Court is a series of cartoons representing the Triumph of Julius Caesar, in which the conception and the handling are throughout inspired by old Roman bas-reliefs. In other pictures of his, the figures look as though cast of bronze, for he was likewise influenced by the sculptors of his own day, particularly by the Florentine Donatello, one of the geniuses of the early Renaissance. Mantegna's studies of form in sculpture made him an excellent draughtsman. Strangely enough, it was this very severe artist who was, perhaps, the first to depict the charm of babyhood. Often he draws his babes wrapped in swaddling clothes, with their little fingers in their mouths, or else in the act of crying, with their eyes screwed up tight, and their mouths wide open. Such a combination of hard sculpturesque modelling with extreme tenderness of feeling has a charm of its own.